Linking text file created from excel or some other source is a powerful tool in controlling parts and assemblies features and custom properties.One of the big hurdle is; text cannot be passed into Global variable (Global variable does not accept text). If global variable accept text, it will open up so many more possibilities. I have an enhancement request since last year. To get some traction on SW front I need some votes. Here is the SPR 640859. Please go and vote for it. Those who use text file to control parts and assemblies will love it. Thanks!
SolidworksParts And Features